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CRER-1068
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Flour and bran samples were obtained by milling a portion
of the wheat exported during the first quarter of 1959.
Skim Milk and Buttermilk Powder
The Canadian "Fallout" Monitoring Network has been
Composite samples from each of the 17
described previously (2).
stations were prepared by combining equal aliquots of 12 consecutive
monthly collections,
in order to minimize seasonal variations and
allow geographical differences to be estimated.
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Other Food Products
Purchases were generally obained in the larger population
centres throughout the country, usually from "Chain" stores which
retail over a province-wide area,
Eight to ten separate purchases
of a particular item were made at various times throughout the
year.
These were combined to provide a single composite sample
for analysis.
As the items comprising the composite sample were
from various sections of the country, the produce is representative
of the country as a whole, rather than a particular area.
EXPERIMENTAL
In most instances one-half to one kilogram of produce
was ashed for the determination of natural strontium, barium and
calcium.
Water samples were evaporated to dryness and the residue
was ashed at 600° C for 24 hours prior to analysis.
For activation analysis, samples of ash were irradiated
in a flux of 2 x 102° neutrons/em“/sec together with a strontium
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epee apart ee
and a barium standard.
Following a one hour period of decay,
strontium carrier was added to the sample and separated chemically
from interfering substances.
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